gomp-20050608-branch/libstdc++-v3/testsuite/tr1/3_function_objects/reference_wrapper/invoke.cc

   1 // 2005-02-27 Douglas Gregor <doug.gregor -at- gmail.com>
   2 //
   3 // Copyright (C) 2005 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10 //
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // 2.1 reference wrappers
  22 #include <tr1/functional>
  23 #include <tr1/type_traits>
  24 #include <testsuite_hooks.h>
  25 #include <testsuite_tr1.h>
  26
  27 using namespace __gnu_test;
  28
  29 bool test __attribute__((unused)) = true;
  30
  31 struct X
  32 {
  33   typedef int result_type;
  34
  35   X() : bar(17) {}
  36
  37   int foo(float x)                   { return truncate_float(x); }
  38   int foo_c(float x)  const          { return truncate_float(x); }
  39   int foo_v(float x)  volatile       { return truncate_float(x); }
  40   int foo_cv(float x) const volatile { return truncate_float(x); }
  41
  42   int operator()(float x)
  43   {
  44     return foo(x) + 1;
  45   }
  46
  47   int operator()(float x) const
  48   {
  49     return foo_c(x) + 2;
  50   }
  51
  52   int bar;
  53
  54  private:
  55   X(const X&);
  56   X& operator=(const X&);
  57 };
  58
  59 int seventeen() { return 17; }
  60
  61 struct get_seventeen
  62 {
  63   typedef int result_type;
  64   int operator()() const { return 17; }
  65 };
  66
  67 void test01()
  68 {
  69   using std::tr1::ref;
  70   using std::tr1::cref;
  71
  72   ::get_seventeen get_sev;
  73   ::X x;
  74   ::X* xp = &x;
  75   int (::X::* p_foo)(float) = &::X::foo;
  76   int (::X::* p_foo_c)(float) const = &::X::foo_c;
  77   int (::X::* p_foo_v)(float) volatile = &::X::foo_v;
  78   int (::X::* p_foo_cv)(float) const volatile = &::X::foo_cv;
  79   int ::X::* p_bar = &::X::bar;
  80
  81   const float pi = 3.14;
  82
  83   // Functions
  84   VERIFY(ref(truncate_float)(pi) == 3);
  85   VERIFY(ref(seventeen)() == 17);
  86
  87   // Function pointers
  88   VERIFY(cref(&truncate_float)(pi) == 3);
  89   VERIFY(cref(&seventeen)() == 17);
  90
  91   // Member function pointers
  92   VERIFY(ref(p_foo)(x, pi) == 3);
  93   VERIFY(ref(p_foo)(xp, pi) == 3);
  94   VERIFY(ref(p_foo_c)(x, pi) == 3);
  95   VERIFY(ref(p_foo_c)(xp, pi) == 3);
  96   VERIFY(ref(p_foo_v)(x, pi) == 3);
  97   VERIFY(ref(p_foo_v)(xp, pi) == 3);
  98   VERIFY(ref(p_foo_cv)(x, pi) == 3);
  99   VERIFY(ref(p_foo_cv)(xp, pi) == 3);
 100
 101   // Member data pointers
 102   VERIFY(ref(p_bar)(x) == 17);
 103   VERIFY(ref(p_bar)(xp) == 17);
 104
 105   // Function objects
 106   VERIFY(ref(get_sev)() == 17);
 107   VERIFY(cref(get_sev)() == 17);
 108   VERIFY(ref(x)(pi) == 4);
 109   VERIFY(cref(x)(pi) == 5);
 110 }
 111
 112 int main()
 113 {
 114   test01();
 115   return 0;
 116 }